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Thexin92 t1_iy8ccvw wrote

He's talking about mammals, not early humans. In ancient times, insects and spiders were of tremendous size due to a higher oxygen concentration in the atmosphere, while early mammals were the size of mice. Those days, spiders sat securely above almost all mammals in the food chain.

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baumpop t1_iy8doks wrote

Shinfo side note. Venom has evolved over 20 separate times on earth.

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